package com.wpw.dream.string;

public class StringTest {
	
	public static void main(String[] args) {
		StringTest st = new StringTest();
		StringBuilder sb = new StringBuilder("abc");
		st.doChange(sb);
		System.out.println(sb);
	}

	public void doChange(StringBuilder sb) {
		sb.append("def");
	}
	
	

}
